Conduit or casing for electrical conductors.



No. 814,217. PATENTED MAR. 6, 1906. 4

` R. H. W. KNIGHT &`L. NAGEL,I CONDUIT 0R CASINGPOR ELECTRICAL lGONDUCTORS.

lAPPLICATION FILED MAB.1,1904.

MTA/E15 ,55S

UNrrnn STATES PATENT OFFICE.

ARICHARD HENRY WHITEKNIGHT AND LUDWIG NAGEL, F LONDON,

' ENGLAND.

CONDUIT OR,CAS|NG| FOR ELECTRICAL CONBUSTOS-it..I

Specification of Letters Patent.

Patented. March 6, 1906.

houses, shops, premises, an the like, as well as for underground power and electric-light conductors; and its particular objects are (a) to provide for easy access to wires and cables for inspection, repairs, or exchange of wires; (t) to uarantee in a corresponding degree more e ciency in insulating and immunity from fire to buildings and the like; (c)to simplify wiring; (d) to effect considerable economy of labor both in installation and maintenance, as with ourtube-conduits and branch pieces any defect in wires or joints may be immediately located. These ob'ects are attained by means of the devices i ustrated in the accompanying drawings, in which- Figurel is a section of over-half-circle open tube; Fi 2, two sections placed in position; Fig. 3, c osed circular-tube conduit; Fig. 4', closed circular tube .T-piece with section through a b; Fig. 5, closed circular-tube crosspiece; Fig. .6, closed circular-tube bend-piece Fig. 7, closed circular-tube spring-piece; Fig. 8, closed circular-tube round-elbow piece 5 Fig. 9, closed circular-tube fuse-box; Fig. 10,' closed circular-tube diminisheryFig. 11, a plan showing branch pieces and conduits carrying wires.

We propose constructing our circular-tube conduit and tube branch pieces as follows: We take stri s of suitable gage sheet-steel, hard bronze, rass, liber com ound, or any other suitable elastic materia shape them into two or more over-half-circle open tubes, Fig. 1, each open tube measuring the same diameter inside and outside. We place the two or more over-half-circle open tubes directly opposite each other, Fig. 2, and by using pressure on top and bottom open tubes they forma complete closed-spring lap-jointed circular-tube conduit, Fig. 3. 'W e purpose constructin our tube branch-oil" and angle pieces-suc as Ts, Fig. e, crosses,Fi f. 5, bends, Fig. 6springs, Fig. 7, round ebows, Fig. 8, also fuse-boxes, Fig. l9, and diminishing sockets, Fig. l-upon the same spring lap-'oint'ed circular-tube principle, as follows:` 'Wie take sheet-steel, hard bronze, brass, fiber compound, or any other suitable elastic material, stamp and shape the particular design of branch-oil' piece required into over-half-circle open-tube parts. We take two open-tube branch-oil pieces of the same design and place the open over-half-circle pieces directly opposite each other, and by using pressure on top and bottom pieces they form a complete closed spring lap-jointed circular-tube branch-off piece.

We purpose insulatin our tube-conduits and branch-off pieces as ollows: W'e take the metallic o en-tube sections of our tube and branch-offp pieces and emerge them slightly heated into a bath of paint, enamel, pitch, bitumen, or rosin compound, after which we allow the sections to cool or' set.

We purpose fixing our tube and branchoil pieces as follows: We commence by taking one section of open tube and nail or screw to walls,woodwork, or the like, adding oval washers to the nails or screws from inside of tube-sections and continuing by lapping each section one inthe other at joints until the bottom sections of tube and branchol pieces are complete, after which we lap and spring over top sections, care being taken that top sections are so arranged that each length passes andiinishes beyond the bottom tube-section joint.

Having now particularly described and ascertained the nature of our said invention and in what mannerV the same is to be performed, we declare that what we claim 1s- 1. A tube consisting of two parts of elastic material of channel form of more than semicircular cross-section, one part fitting in the other.

`2. A tube having portions at angle to each oifbol, Said portions being made uf of two 5 PML- S of eiastio material of @hanne form of moi@ Athan semiorcuiar cross-section', one parti. .ttirg in the other, substantially as de- In Witnoss whereof We have heeimto set' our hands 1n presence of' two Witnesses.

RICHARD HENRY WHITE KNIGHT.

LUDWIG IAGEL.

Vi/vtnesses:`

H. D. JAMESON, A. NULTEY. 

